For me it's that Vim offers me enough to satisfy what I want out of a development experience and vim is also installed everywhere which means I can carry my setup around to pretty much any machine (including servers when doing remote administration).
Since Vim 8 launched with a built-in package manager I'm able to store my vimrc and any extensions in git and easily grab it on any new machine I'm on. The level of effort required for me to convert to Lua and adopt newer nvim version of plugins I use seems too high relative to the benefits.
Since Vim 8 launched with a built-in package manager I'm able to store my vimrc and any extensions in git and easily grab it on any new machine I'm on. The level of effort required for me to convert to Lua and adopt newer nvim version of plugins I use seems too high relative to the benefits.